Pipe organ



June 1], 1929. A.- MOORHOUSE ET AL PIPE ORGAN Sheets-Sheet 1 Filed Feb.'7, 1928 WITNES 5E5 INVENTORS June 11, 1929..

. A. MOORHQUSE ET AL PIPE ORGAN Filed Feb. 7, 1928 7 Sheets5heet 2WITNESSES MW INVENTOR 5 Wimfiuu.

June 11, 1929. A. MOORHOUSE ET AL 1.716.651

\ PIPE ORGAN Filed Feb. '7, 1928 '7 Sheets-Sheet 5 J K wwuzsszs H 3m 5mmINVENTORS M6 441 7 Sheets-Sheet "4' PIPE ORGAN Filed Feb. '7, 1928 A.MOORHOUSE ET AL II 2! 1 I h iz' Iii III-33 I! I i T "'1.

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WITNESSES Mal u/L '7 Sheets-Sheet 5 JYJll'll'I IIJHF PIPE ORGAN A.MOORHOUSE ET AL Filed Feb. 7, 1928 June 11, 1929.

wlrusssss June 11, 1929.

A. MOORHOUSE ET AL PIPE ORGAN Fil ed Feb. '7, 1928 7 Sheets-Sheet 6INVENTOR WIT ESSES June 11, 1929. A. MOORHOUSE ET AL 1.716.651

PIPE ORGAN Filed Feb. '7, 1928 7 Sheets-Sheet WITNESSES 4 v INVENTOR; WMMM Patented June 11, 1929.

UNITED STATES ALFRED MOORHOUSE AND SAMUEL G. BOWMAN, OF PITTSBURGH,PENNSYLVANIA.

PIPE ORGAN.

Application filed February 7, 1928. Serial No. 252,455.

This invention relates to combination stops for pipe organs, andspecifically to means for setting up any number of combiuations (withinthe limitations of the particular apparatus), so that the organist mayas he plays give such permanence to any combination he may haveproduced, that, continuing in his playing to shift the stops, he maystill, by the shifting of a. combination stop, restore that particularcombination.

The accompanying drawings illustrate the invention. F ig. I is a view inperspective of apparatus which, associated with other apparatus set inposition adjacent to the manual of an organ, embodies the invention.Fig. II is a view in vertical and longitudinal section, and Fig. III isa view in vertical and transverse section, of the apparatus of Fig.,I.The plane of section of Fig. II is a broken plane, indicated by the lineII-II, Fig. III. Fig. IV is a diagrammatic view in horizontal section,on the plane indicated at IV-IV, Fig. II. Fig. V is a fragmentary viewin horizontal section, on the plane indicated at V-V, Fig. III. Fig. VIis a fragmentary view in vertical section, and Fig. VII a view inelevation, illustrating to larger scale and with greater particularity adetail of the apparatus as seen in Figs. III and II. Fig. VIII is a viewin vertical section, illustrating to larger scale and with greaterparticularity another detailof the apparatus which in Fig. II is shownin vertical section. Fig. IX is a view in vertical and transverse section through the tablet board of an organ, equipped with apparatuswhich, cooperating with the apparatus illustrated in the earlierfigures, constitutes an embodiment of the invention. Fig. X is a view infront elevation of the tablet board of Fig. IX. Fig. XI is adiagrammatic view in rear elevation of a portion of the apparatus shownin Fig. IX, and the field of view is in Fig. IX indicated by the bracketXI-XI. Fig. XII is a diagrammatic view in horizontal section, on theplane indicated by the line XII-XII, Fig. IX.

Referring, first,,to Figs. IX-XII of the drawings, upon the back of thetablet board 1 of the organ (which, as will be understood, is locatedadjacent the key-board) is mounted a succession of rectangular metalframes 2. These frames are electrically insulated in such mounting andstand apart one from another. In each frame on one side is pivoted ametallic bar 3 which terminates in an aicshaped cross-arm 4 of iron. Thecenter of curvature of the arc coincides with the center of pivoting ofthe bar. In each frame on the opposite side is pivoted a leaf spring 5,of copper or of other suitable resil ient and conducting material. Thespring at its end engages a notch in the cross-arm 4t, and thearrangement is such and the strength of the spring is such, that, as thebar 3 is swung (vertically, as seen in Fig. IX) across the dead centerbetween the two pivot points, spring tension is exerted, tending toswing the bar 3 upward or downward, as the case may be, and to hold itfirmly and surely in abutment upon either the insulating cushion 6 aboveor the insu lating cushion 7 below, which two cushions are carriedsecurely upon the frame.

Means are provided for swinging bar 3, both manually and directly. andmechanically and indirectly. In order that the or-- ganist may swing thebar 3 manually and directly, the bar is prolonged through a slot in thetablet board 1, and there presents to the organist an extension 8 whichconveniently will be'of insulating material, ivory or a substitute forivory. The means for swinging the bar 3 mechanically and indirectly arefound in clectro-magnets 9 and 10, mounted within the frame, vithrespect to both of which the cross-arm 4. serves in turn as an armature.

The spring 5 protruding at its further end beyond the frame, as Fig. IXshows, is adapted to make and break electrical contact with a pole-piece11 borne by, though insulated from, frame 2.

Fig. IX shows in full lines the bar 3 in its lower position, thecross-arm 4 held under slight but sufficient spring tension upon.cushion 7. In this position the make-and-break device is open. lVhen,either under the hand of the organist or by the energizing ofelectro-magnet 9, the bar 3 is swung up ward to the dotted-lineposition, the makeand-break device is closed. 'A circuit m is thencompleted through the frame 2 and through the pole piece 12 borne by andelectrically united with the frame. The circuit m so completed throughbinding posts 11 and 12 is effective, by known instrinnentalities, tobring into operation a particular set of organ pipes. The word stop isused in two senses: in one sense it signifies the bar 3 or its extension8, orequivalent manually driven element; in the other sense it signifiesthat portion of the organ, that aggregate of pipes, which is responsiveto and comes into operation under the control of other, will depend uponthe connection in which it is used. Each'ba'r 3 with its extension 8 isa stop, and those sets of jplpes wlnch severally are under the controlof the bars 3 are the stops. When the organist depresses an extension 8from the full-line position of. Fig. IX to the dotted-line position, he

I brings the corresponding portion of the organ into playing condition,so that as the k s subsequently are pressed, the correphragm 18.

sponding pipes within that portion of the organ speak.

Referring to Figs. LVHI, and particularly to Figs. 11 and VIII, whena'bar 3 is shifted upward and a circuit m is closed through two polepieces 11 and 12, an electromagnet 13 arranged in the circuit is energized. This electro-magnet' is one of a series arranged within a commonwind box 1-i. The wind box 14 is a chamber with airtight walls filledwith air under pressure. Within thewind box 14 is arranged a seriesofbellows 15, corresponding in number to the bars 3 on the tablet board.Each bellows is connected to a longitudinally shiftable rod 19 andnormally is held by the tension of a spring 16 in expanded condition.From the bellows a passageway leads to a valve chest. with oppositeopenings leading, one of. them to the open air, the other to theinterior of the windbox, and within the valve chest is arrangeda valve'17 which alternately closes one or the other of such opposite openings,leaving the other free. Figs. 11

and VIII show thevalve in the position of closure upon the openingwhichleads to the openair, and the bellows in free 00111- municationwiththe'wind box. I .Vhen valve 17 is in this position, the movable headof the bellows issubject to like pressure conditions on its two sides,and, such being the case, the spring 16 is effective to hold the bellowsin the expanded condition shown in .he valve 17 is mounted on a stem,which stein isadditionally'secured to afiexible dia- Thediaphragm 18forms part of thewall ofv the wind box chamber. The diaphragm chamber,or space on the opposite andiouter side of the diaphragm, coinmunicatesthrough a passageway with a valvechest from which opposite openingslead,.one to the open air, the other to the interior of the wind box.\Vithin this sec ond valve chest is arranged a second valve 18. Theparts are so proportioned that the valve, which conveniently isdisk-shaped and consists of a plate of iron faced on itsupper side withsuch elastic sealing substance as a layer of felt or fibre of'finetexture, has little or no lateral play. It has vertical play through anarrow interval, to close alternately one or the other of the oppositeopenings in the last mentioned valve chest. The disk 18 constitutes anarmaturefor the electro-magnet 13.

The rod 19 carried by bellows 15 is'arranged beneath a slotted board 20.The rod carries flexible and elastic contact pieces 21 which rise, onethrough each of the slots. Com iarin Figs. 11, III, and IV, it will beremarked that in this instance four bars 19 are provided, one for eachbar 3, arranged in parallelism, and that the slots in board 20 extendtransversely of the length of the bars. It will further be remarked thatthe number of slots is in this instance four and that each bar 19 isprovided correspondingly with our flexible contact pieces 21. T her isno necessary correspondencebetween the uber of bars 19 and the number ofslots in lzoardQO. Bars 41, conveniently downwardly tapering in shape,move vertically, de-

scending into and rising from the slots in board 20. 1 I

lVhen the parts are inactivcpand when electro-magnet 13 is notenergized, pressure within wind box 14; drives disk 18 upward and holdsit in position of closure upon the opening to the open air. Thediaphragm chamber then is in open communication with the interior of thewind box; pressures upon opposite sides of the diaphragm are equal;and,valve 17 also being held by pneumatic pressure to position ofclosure up on its opening to the open air, the spring .16 is effective,as has been said, to distend the'bellows 15 andto hold them distended-When a stop 8 is depressed, bringing into operative condition apartieularset of pipes, a corresponding clectro-n'iagnet 18- within thewind box let is energized, its armature 18.is attracted and thecorresponding diaphragin chamber, no longer in communication with thewind box, is then vented to the open air. The corresponding valve 17 isshifted, the correspondingbellowslo, vei t- 7 ed to the air,-iscollapsed, and the corresponding bar 19 is shifted against springtension from right to left, Fig. II.

Referring again to Figs. IX-XIL a set of longitudinally movable plungersorcoin bination stops 22 is mounted within the reach of the organist.The number of these combinationstops may 'be as many as the builderwill; but to them the slotsin board 20 and the elastic contact pieces 21borne by the several bars 19 correspond in number.

As here shown, the number isfour.

and a valve, such in character as that Each combination stop is heldnorm-all y by springs 23 and 24 in position shown in Figs. IX and XII,and from this normal position it may be shifted by the organirtlongitudinally, either in or out. \Vhen re leased, it returns underspring tension to the normal position shown. The shank of thecombination stop is metallic and it extends through and is guided bymetallic rings and 26, and these rings pair by pair are included in aline a I) of electric flow, in which line, it will be understood asuitable source 01 electric energy 1s lncludcd. The shank of the stopcarries a contact bar 21, and adjacently on one side is set the flexibleHole piece 28, and on the other side the su sively stationed flexiblepole pieces 29 and 30. lVhen the organist presses the ---;nnbinationstop inward, shitting it from right to left, he brings bar 27 to contactwith pole piece 28 and brings a line 0 into closed ('1'- cuit with thesource of electric energy; when he pulls the stop and shifts it fromleft to right he brings bar 27 to contact first with pole piece 29 andthen additionally with pole piece 30, and first brings a line (Z intocircuit, and then additionally the line 0 into circuit with the sourceof encr y. \Vhen he releases the stop, it returns to normal position,and the circuits are broken.

Figs. II, III, VI and VII illustrate a switch which consists of twopii-Joted bodie; 31 and 32 and operating niechanisi'n. i springs 40 and41 tend to hold these two bodies in the elevated position illustrat Fig.III, and from such position the in alternation swung downward a springtension by. the collapse of th; bellows 33 and 34. The bellows arearranged both of them within a wind box Cooperating with each bellows 1sa dia. n

already described but, while the val e 36 as sociatcd with bellows 33 isarrang l within its valve chest, the valve 37 associated with bellows 34is double and closes oppositely, to cut off communication between windbox and bellows and between bellows and the open air. The two diaphragmchz'uuliers intercommunicate, as appears in Fig. II. A valve 38 underthe control of an electromagnet 39, such as that already described,determines the shifting of the switch.

Normally, as shown in Fig. II, electri magnet 39 is not energized;bellows 34. vented to the air, is collapsed; bellows 33, incommunication with the. wind box and der the tension of spring 40, isexp-ant 1. When electro-magnet 39 energized, valve 38 uncovers the ,ventport, the two d phragins move upward, and the two f s assume theiralternate positions. Bellows 33 then, vented to the air, collapses, andswings body 31 downward, while bellows 34, in communication with thewind box, ex-

pands. Its expansion is aided and the up ward swing of body is elt ectedby the tension of spring 41..

Each of blocks 31 and 32 carries a plurality of resilient contact pieces42, conveniently loops of wire, corresponding in number to the bars 3,and these contact pieces, as the. bodies 31 and 32 swing, alternatelymake and break contact with a. corresponding set of contact pieces 43.These .iake-and-break devices are arranged in the lines 0 associatedwith the several combina tion stops The contact pieces 43 of the twogroups are interconnected in pairs, as indicated by the Roman numerals,Fig. VII; and as the bodies 31 and stand in their alternate positions,the line of electric circuit is established either through one of theleads 0 on the left (Fig. VII) or through one of the leads 7 on theright.

Figs. II and III show the bars 44 in position on the slots in heard 20.These bars 44 are carried on rods which extend downward from a set ofbellows 45, arranged within a wind box 46. (lonnnunication from withineach bellows alternately with the op n air and with the interior of thewind box, is under control of such a diaphragin-controiled valve 47, asthat already described, and tor each diaphragm a control valve 48operated by an elect o-magnet 49, all such as already described, isprovided. Springs 50 tend to expand the bellows 45 and to hold the bars44 in the slots in board 20.

A wind box 53, Figs. I, III, and V. contains a series of bellows 54,corresponding in number tothe combination stops 22, and these bellows,normally expanded under spring tension are, on the energizing of accn'responding series of elcctro-niagnets through such means as thosealready described, individnally collapsed. The collapse of one of thebellows eflects the closing of a corresponding switch 56. The expansionof the bellows opens the switch again.

Vithin ach slot in board 20 are sets of elastic make-and-break devices,those on one side arranged each in one of the circuits 8 in which one otthe eleclakoanagnets 9 (Fig. IX) is included, those on the other sidearrai'iged each in a circuit 6 in which one of the electro-magnets 10 isincluded.

' Each bar 44 in its descent not only closes the nets-55, and each ofthe tour leads 6 on the left of the reversing device is in continuouscircuitwith one of the electro-inagnets 49. When a'swit-ch' 56 is closeda lead 9 is brought into continuous circuit with 0111' leads h, each ofwhich (as is indicated in Figs. III and IV) isin continuous circuit withone of the tour flexible and elastic contact pieces .21 with which eachof the bars 19 is equipped. In circuit through the lead g is arranged asuitable source of electric energy.

The wind boxe's lei, 35, 4-6, and 53 are in Fig. I shown to beinterconnected, and it will be understood that during operation they arefilled with air under pressure.

The organist in playing brings into operation one set of pipes andanother by swingbig one and another of the stops 8. When for aparticular passage of music he has so brought into operation a desiredcombination of sets of pipes, 1e may by the instrumentalities shown anddescribed preserve it and, when the time comes,-restoro it again. Withthe swinging of each stop 8 corresponding bar 19 (Fig. II) has beenshifted from right to left. Having a given combination of stops. inoperation, the organist pulls out one of the combination steps 22 anyone he will and releases it again. He will not of course pull out onewhicii he already has in service for preserving another combination.lVhen' he pulls out the combination stop 22, he brings'its contact bar27 into contact with flexible pole piece 28 and brings the lead act thatparticular combination stop into circuit with asource of electricenergy. At the time, the sv itch apparatus is in the position shown inFig. II.

An electric circuit then is established through the correspondingmakeand-break device 42, a3, -through the corresponding lead 6 on theleft VII), and through the corresponding electro-magnet 49. The

magnet is energized and the correspondingbar a l is elevated. When theorganist releases the combination stop again, as immediately he does,the combination stop returns under spring tension to its normal inactiveposition, the. electrical contacts then are broken again, and the bar aswhich has been elevated descends again,.under the tension of spring IThe bar 44: when it rises, rises clear of the upper ends ofthe'fieiiible and elastic contact pieces 21, and when the contact pieceswhich extend upward through this particular slot are so left tree, somany of them as are borne by bars 19 which have been shifted from normaliosiirion to the left Fi II swing to the left hand side of the slot.Then the descending bar ie captures the contactpieces and holds themeach in electriccontact with either a make-and-breal: device 51 on onesideot the slot or with a make-and- H break device 52 on the other side.In its descent the bar il also closes these makeandbreak devices. Theorganistwill then continue to play upon the organ, making changes instops as he will. i

\Vhen thereafter he desires to restore the particular combination whichin the nianner described he has preserved with a particular combinationstop, he presses that combination stop in and releases it again. Inpressing the bLUP in he his. bringsthe lead ito circuit with a source ofelectricalenorgy, and then, immediately thereafter, lead as well. lVhenhe releases the combination stop again, it returns to neutral position,

opening both circuits a circuit through lead (Z energizes thecorresponding electroanagnet 39. In consequence, the switch is reversed;the body 31 swings downward, breaking the set of contacts on the let't(Fig. VII), and the body 32 swings upward, closing the set otcontacts onthe ri ht. The circuit which by the further advance of combination stop22 is established through-lead 0 is then established through the cospending 'niako-and-break device 42, eil, and through the correspondinlead 7'' on the right, Fig. VII. The cor re )oiidiiig electreanagnet 55then is enmod and the corresponding switch 56 is m 0 Tim closing of oneof the switches .56 esagain. The closing of i tablislies an electriccircuit from source oi ing oi ais 3 as will reestablish the conibina-The release of the combination stop;

tion. will effect the opening of. the circuits and the deenergizing ofthe magnets, but the bars 3 will remain under spring tension in thepositions to "which they .hav been brought, and the particularcombination will continue in efiect until the organist voluntarilychanges it.

IVhen a combination 3 released, the corresponding bar a i captures thecontact pieces '21 in an arrangement corresponding to the then existingcombination. VJhen thereafter that same combination sop is pressed in,the particular arrange ment of tlie'cantured i tact pieces isZ effectivethrough .agnets 9,l0, to reestablish the same combination.

We. claim asfourinvention: w 1. In mechanism for controlling the steps01 is pulled out and of a pipe organ, two lines of opposite pairs ofcontact pieces, a plurality of independently movable contact piecesextending one between each pair of the contact pieces first named andadapted by such movement to close contact alternately through one or theother of the contact pieces of the pair, a plurality of stop levers, apair of electromagnets associated with each stop lever and adapted tomove the stop lever, one to on position, the other to oil position, andmeans for energizing one magnet of each pair or the other, according asone of the movable contact pieces is in contact-closing position withone or the other of the pair of contact pieces with which it isassociated, together I with means for securing the plurality of movablecontact pieces in such contact-closing positions as at a given momentthey may occupy.

2. The combination of claim 1, the means for securing the contact piecesbeing movable to and from operative position.

3. In mechanism for controlling the stops of a pipe organ, a pluralityof double lines of opposite pairs of contact pieces, a plurality ofindependently movable carriers on each of which is borne a set ofcontact pieces, one contact piece of each set extending between a pairof the contact pieces first named, and adapted by the movement of theset to close contact alternately through one or the other of the contactpieces of the pair, a plurality of stop levers, a pair of electromagnetsassociated with each stop lever and adapted to move the stop lever, oneto on position, the other to oit position, and means for establishingelectrical leads to one magnet of each pair or the other, according asthe movable contact pieces of one set are in contact-closing positionwith one or the other of the pairs of contact pieces with which they areassociated, a plurality of independently movable means for securing oneof the contact pieces of each movable set in contact-closing positionwith one of the V opposite pairs of contact pieces with which it isassociated, and means for simultane ously energizing one of theelectro-magnets of each pair through one or another of the double lineof contact pieces first named.

4. In mechanism for controlling the stops of a pipe organ, a slottedbody, an abutment movable to and from a position of closure in suchslot, opposite pairs of contact pieces borne by said slotted body andarranged along the sides of such slot, a plurality of bars arrangedadjacent to said slotted body and independently movable in a directiontransverse to such slot, and carrying each a contact piece whichprojects through the slot in the slotted body and between a pair ofcontact pieces borne thereby, a plurality of stop levers, a pair ofelectro-magnets associated with each stop lever and adapted to move thestop lever, one to on position, the other to off position, and means forenergizing one magnet of each pair or the other, according as one of thebar-borne contact pieces is in contact-closing position with one oranother of the pair of contact pieces with which it is associated.

5. In mechanism for controlling the stops of a pipe organ, a bodyslotted with a plurality of slots, a corresponding plurality ofabutinents independently movable to and from positions of closure in theseveral slots, opposite pairs of contact pieces borne by said 'lottedbody and arranged along the sides of such slots, a plurality of barsarranged adjacent said slotted body and independently movable in adirection transverse to such slots and carrying each a plurality ofcontact pieces, one contact piece of each bar projecting through each ofthe slots in the slotted body and between a pair of contact pieces bornethereby, a plurality of stop levers, a pair of eiectro-magnctsassociated with each stop lever and adapted to move the stop lever, oneto on position, the other to off position, and means for establishingelectrical leads to one magnet of each pair or the other, according asthe contact pieces of one bar-borne set are in contact-closing positionwith one or the other of the pairs of contact pieces with which they areassociated, and means for simultaneously energizing one of theelectro-magnets of each pair through the contact pieces arranged in oneslot or another of the slotted body.

6. In mechanism for controlling the stops of a pipe organ, two lines ofopposite pairs of contact pieces, a plurality of independently movablecontact pieces extending one between each pair of the contact piecesfirst named and adapted by such movement to close contact alternatelythrough one or the other of the contact pieces of the pair, a pluralityof manually movable stop levers, a pair of electro-magnets associatedwith each stop lever and adapted to move the stop lever, one to onposition, the other to off position, means for energizing one magnet oi.each pair or the other, according as one of the movable contact piecesis in contactclosing position with one or the other of the pair ofcontact pieces with which it is associated, and means for securing theplurality of movable contact pieces in such contactclosing positions asat any given moment they may occupy, the said movable contact piecesbeing responsive in their movement, each to the manual movement of oneof said step levers.

7. In mechanism for controlling the stops ot a pipe organ, a pluralityof double lines of opposite pairs of contact pieces, a plurality ofindependently movable carriers on each of which is borne a set ofcontact pieces, one contact piece o'l each set extending bepair, aplurality of stop levers, a pair 01 electro-magnets associated with eachstop lever and adapted to move the stop lever, one to on position, theother to off position,

' means for establishing electrical leads to one magnet of each pair orthe other, accordare in contact-closing position which one or the otherof the pairs of contact pieces with which they are associated, aplurality of movablecombination stops, and means associated witheachcombination stop and made effective by themovementthereof, forsimultaneously energizing through one of n double line of contactpieccsi'irst named one of the electro-magnets of each pair.

8. The combination of claim together with a plurality-of combinationstops each movable in twodirections, the said means for securingthecontact pieces being severally movable in response to the movement ofthe severalcombination stops in one direction, and the means forenergizing the electro-magnets through the several lines of contactpieces being responsive to the movement ofthe several combination stopsin the other direction. 7

9. In apparatus for operating a pipe or gain-a manually movable stoplever includinga pivoted bar terminating in an areshaped cross-arm whosecenteroi curvature coincides with the center ott pivoting of the bar,two electro-magnets associated with the stop lever with respect to bothof which the cross-arm otthe stop lever, constitutes an armature, acombination stop, and means under the control of such combination stopforenergizing selectively one of the said electro-magnets or the other.

10. in a aratus for operatin a pipe organ, azvertically standingmetallic frame, a metallic stop lever pivoted in said frame on one sideand :movahlevertically on its pivot, such lever protruding beyond itspivot oomt through the frame in a manually accessible extension, aspring of metal pivoted in the said- :ame on its other side, and

engaging the stop lever, its tension efiective.

as the lever and spring swing in unison across a line oi dead centertoipress the said lever-alternately upward and downward, the said springconstituting a make-and-break device ina stop-operatingelectricalcircuit, said framerbeing provided with abutments of insulatingmaterial, adapted to limit and define the range-of movement 01 the stoplever.

11. The structure of claim 10, together with two electro-magnetsarranged within mg as the movable contact pieces o1 one set theframe,"withrespect toboth ofwhich said stop lever constitutes anarmature, and means for energizing selectively said electro-magnets.

12. In apparatus for operating a pipe organ, a combination stop memberheld normally in neutral position and movable oppositely in twodirections against spring tension, a plurality of stop levers,stop-lever moving apparatus including a series of make-and-breakdevices, the said make-and break devices being severally responsive tomovements of the stop levers, means made operative by movement of thecombination stop in one direction for securing the said make-and-breakdevices in such positions as, in consequence of the shifting of the stoplevers, they may have assumed, and n ns made operative by movement o'l'the cm nation stop in opposite direction and including saidmake-and-brcal: devices for making effective said stop-lever movingapparatus.

13. In apparatusror controlling a pipe orthe combination of va movablestop member, a bar movable longitudinally against spring tension,andmeans tor etlecting bar movement on'the movement of said stop member,a body arranged adjacent saidbar and slotted with aslot extending transelastic contact piece extending through th slot in said slotted body,electrical cont lct pieces borne by the said slottcdbody and arrangedWithin and. on opposite sides of such slot and adj-acentithecont-actpiec iii-st named, the contact piccc'tirst named extendingnormally at one side ofthe slot-or the other, according as the barwhichicarries it is in one or the other 'otits alternate positions, apair of eloctro magnets adapted when alternately energized to shift:said stop member alternatelyzto onaand'oil' positions, a combinationstop.movable-alternately from anintermediate POSllllOll-illl onedirection or the other, anabutment movable against spring tension fromnormal position in said slot, means operative by imovement of thecombination '{stop in one direction to cause the said abutment to moveout of said slot, an electrical 'circuitrincluding a switchadapted to-becompletedlthrough one ofsaid electro magnets or the other,:-accordinglyas said flexible and' elastic' contact piece-makes contact on one sideof the slot or the'othcig'and means operative-by movement, of saidcombination-stop iniopposite direction for closing said switch.

In testimony whereof we have hereunto set our hands. V

' ALFRED MOGRHOUSE.

SAMUEL G. BOlV'iVlAN.

